Windows: Make file_util::Delete("c:\\foo_dir", false) work correctly. Add more unit tests for Delete

chrome/installer/util/copy_tree_work_item_unittest.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <windows.h>
 
 #include <fstream>
 #include <iostream>
 
 #include "base/base_paths.h"
@@ skipping 24 matching lines @@
       temp_dir_ = test_dir_.AppendASCII("temp");
       file_util::CreateDirectoryW(temp_dir_);
 
       ASSERT_TRUE(file_util::PathExists(test_dir_));
       ASSERT_TRUE(file_util::PathExists(temp_dir_));
     }
 
     virtual void TearDown() {
       logging::CloseLogFile();
       // Clean up test directory
-      ASSERT_TRUE(file_util::Delete(test_dir_, false));
+      ASSERT_TRUE(file_util::Delete(test_dir_, true));
       ASSERT_FALSE(file_util::PathExists(test_dir_));
     }
 
     // the path to temporary directory used to contain the test operations
     FilePath test_dir_;
     FilePath temp_dir_;
   };
 
   // Simple function to dump some text into a new file.
   void CreateTextFile(const std::wstring& filename,
@@ skipping 649 matching lines @@
   EXPECT_TRUE(file_util::ContentsEqual(file_name_from_1, file_name_to_1));
 
   FilePath file_name_to_2(dir_name_to);
   file_name_to_2 = file_name_to_2.AppendASCII("2");
   file_name_to_2 = file_name_to_2.AppendASCII("File_2.txt");
   EXPECT_TRUE(file_util::PathExists(file_name_to_2));
   LOG(INFO) << "compare "
             << file_name_from_2.value() << " and " << file_name_to_2.value();
   EXPECT_TRUE(file_util::ContentsEqual(file_name_from_2, file_name_to_2));
 }